Determine Whether an Array in JavaScript Is a Subset of Another Array

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Using the [array every method, we can find out if an array is a subset of another array. This method iterates through each element in an array and performs a test on it. If every element in the array passes that test, then the overall `every` method will return true. For each evaluation, we have a "parent" array, and a "subset" array - where we want to check if the "subs" array is fully contained within the parent array.